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7325628 |
A seabed anchor ( 20 ) is fixed to and deployable from an ROV ( 10 ) for positively anchoring the ROV ( 10 ) to the seabed ( 100 ). The seabed anchor ( 20 ) comprises three nested telescoping tubes ( 26, 28 , & 30 ). The upper end of th...
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7255180 |
A modular transfigurable drilling rig comprises one or more transfigurable containers with drilling equipment to form an operational drilling rig. The transfigurable containers include a first and second load bearing support and a load b...
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6691784 |
In a substructure ( 10 ) for a floating oil or gas production platform, an arrangement to tension a plurality of risers ( 16 ) extending from the sea bed up to the substructure, the arrangement comprising: a conventional hydraulic tensio...
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6622793 |
A method for carrying out operations on petroleum and gas fields is provided. The method involves using a platform which is located underwater when in working position at a depth where it is not subject to storm waves or under the lower ...
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6579040 |
An air-can riser tensioning device for use in the production of oil and gas at offshore locations includes at least one air-can used to place a vertical force on the riser. The air-can includes an open port that extends into the water to...
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6488447 |
A buoyancy system for a deep water floating platform includes at least one composite buoyancy module coupled to the a riser having a length greater than 1000 feet and an associated weight. The composite buoyancy module is sized to have a...
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6435775 |
A buoyancy system for a deep water floating platform includes at least one buoyancy module coupled to the a riser. The module may be coupled to a ring structure of an end cap coupled to the riser, or two modules may be coupled to a ring ...
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6408948 |
A tubing handling for subsea oilfield tubing operations, includes an isolation tube to mechanically and/or chemically protect the drill string and improved passage of the drill string and fluid return line to the drilling vessel that fur...
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6244347 |
There are disclosed two embodiments of a subsea drilling, completion and/or workover apparatus which includes a spar buoy having a well therethrough, and a riser which extends through the well in the buoy for connection to the subsea wel...
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6171027 |
A drilling rig, in particular for the offshore industry, in the form of a jack-up platform on which a cantilever is mounted so as to be movable at least substantially horizontally and in a first direction, with the cantilever projecting ...
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6047781 |
A multi-activity drillship, or the like, method and apparatus having a single derrick and multiple tubular activity stations within the derrick wherein primary drilling activity may be conducted from the derrick and simultaneously auxili...
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6000480 |
The present invention relates to an arrangement in connection with the drilling of oil wells, especially with coil tubing, and more specifically an arrangement comprising heave compensation by such drilling, comprising a first frame-like...
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5240081 |
A subsea well drilling and completion system allows the use of a jack-up rig for drilling with completion by a floater rig. The system uses an outer wellhead housing which is run on releasable conductor riser. An inner wellhead housing i...
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5044450 |
A spar-buoy type boring device including a main pipe and a central pipe installed in the main pipe. The main pipe, which has a service deck at the top and a float near the top so that the float stays underneath the water, is anchored at ...
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4919065 |
The invention is related to a submarine vehicle for the deep ocean research. This vehicle is composed of a penetrator (1) and of a support structure (2 to 7). The vehicle descends by gravity due to a ballast disposed in the lower part (1...
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4913238 |
A floating/tensioned production system for use in deepwater drilling and production operations generally combining a relatively small tension leg platform with a semisubmersible platform. The semisubmersible platform is provided with a w...
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4762185 |
A semi-submersible drill rig structure includes a ring-like enclosure surrounding a central drilling axis. In the structure are magazines holding drill string elements vertically. Lifting means on the structure raise the vertical drill s...
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4716972 |
A floating semisubmersible off-shore drilling platform or the like comprises an upper working level portion and a lower pontoon portion. When the platform is transported from one place to another, it floats on the pontoon portion, but wh...
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4702321 |
A drilling, production and oil storage caisson for use in deep water offshore well operations in which the caisson has such a deep draft that its bottom end is subject only to minimal excitation forces caused by wave, wind and current ac...
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4630681 |
A multi-well hydrocarbon development system is economically established and operated by drilling cluster wells through the piles securing the base structure which supports a semisubmersible tension leg buoy through a single leg assembly....
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4502551 |
A deep draft oil well drilling platform having a large hollow body is shaped, designed, and ballasted to have a substantial portion thereof submerged under the surface of the ocean a sufficient distance to be substantially unaffected by ...
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4305468 |
A method for drilling wellbores from an offshore platform to penetrate a subterranean formation using a combination of surface drilling techniques and subsea drilling techniques to achieve an improved effectiveness by avoiding the necess...
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4136996 |
Marine structure adapted to be fixed to the ocean floor for drilling wellbores into the latter. A drill conductor cage is removably positioned within the marine structure at a submerged position. The cage holds one or more drill string g...
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4100754 |
Pipes which are to be inserted vertically into the sea bed for the extraction of fluids therefrom, such as liquids and gases, are connected together in groups, with each pipe group being constructed on shore and then supported horizontal...
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4068729 |
A multiple well platform is described for producing hydrocarbons, preferably using a free-standing single riser caisson. Although the wells are connected up to the surface, the largest casings (and preferably most of the other casings) a...
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4054104 |
A submarine well drilling and geological exploration station includes an inner pressure hull specially configured for submerged drilling and exploration and an outer fairing hull of conventional submarine design. The pressure hull is div...
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4030310 |
Apparatus for providing directional drilling from an offshore drilling platform, the drilling platform being of monopod construction with a submerged base, a single vertical column extending up from the base and supporting a platform abo...
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3902553 |
Apparatus for drilling and completing hydrocarbon producing wells in waters of a substantial depth and for the redrilling and servicing of such wells. The apparatus includes a surface drilling rig, normally of the semi-submersible type, ...
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3875998 |
An installation for separation on the seabed of the effluents from underwater oil wells, consisting of a base with negative buoyancy anchored on the seabed, a hermetic caisson attached to this base and preferably articulated on it, equip...
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3709307 |
An elongated housing having a fluid tank extending about its axis is divided into a plurality of housing chamber portions by decks extending therethrough, is maintained in a substantially vertical position spaced preselected distances fr...
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3682242 |
The specification discloses a method and system for producing minerals from an underwater production area where the marine bottom slopes from relatively shallow depths to greater depths. A bottom-supported platform is fixed in the relati...
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3602320 |
This invention relates to an underwater, manned vessel useful for drilling in piles, setting anchors and taking samples of the bottom of a body of water. A conventional submarine vessel is modified to have a vertical passage therethrough...
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3512783 |
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3511312 |
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3456720 |
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3442340 |
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3395755 |
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3294185 |
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3221506 |
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3184541 |
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3111692 |
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3101798 |
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3063507 |
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3044561 |
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3004602 |
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3001592 |
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2973046 |
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2970646 |
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2970447 |
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2965174 |
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